<html>
<head>
    <style>
        div {
            margin:10px;
        }

        div span {
            background-color:#fff;
            font-size:small;
        }
    </style>
   <link rel="stylesheet" href="dataurl-nonbase64-doublequotes.css.min" type="text/css">
   <link rel="stylesheet" href="dataurl-nonbase64-noquotes.css.min" type="text/css">
   <link rel="stylesheet" href="dataurl-nonbase64-singlequotes.css.min" type="text/css">
   <link rel="stylesheet" href="dataurl-base64-doublequotes.css.min" type="text/css">
   <link rel="stylesheet" href="dataurl-base64-noquotes.css.min" type="text/css">
   <link rel="stylesheet" href="dataurl-base64-singlequotes.css.min" type="text/css">
</head>
<body>
   <div class="nonbase64-doublequotes"><span>non-base64 ("")</span></div>
   <div class="nonbase64-noquotes"><span>non-base64 ()</span></div>
   <div class="nonbase64-singlequotes"><span>non-base64 ('')</span></div>

   <div class="base64-doublequotes"><span>base64 ("")</span></div>
   <div class="base64-noquotes"><span>base64 ()</span></div>
   <div class="base64-singlequotes"><span>base64 ('')</span></div>
</body>
</html>